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lib/Algorithm/CheckDigits/M10_008.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M10_008;

use 5.006;
use strict;
use warnings;
use integer;

use version; our $VERSION = qv('v1.3.6');

our @ISA = qw(Algorithm::CheckDigits);

my @weight = ( 1,3,1,7,3,9,1 );

my $value = 0;
my %ctable = map { $_, $value++ } ( '0'..'9', 'A'..'Z' );

my $re_alpha = qr/[B-DF-HJ-NP-TV-Z]/;
my $re_alnum = qr/[0-9B-DF-HJ-NP-TV-Z]/;
my $re_sedol = qr/(\d{6}|$re_alpha$re_alnum{5})(\d)?/;

sub new {
	my $proto = shift;
	my $type  = shift;
	my $class = ref($proto) || $proto;
	my $self  = bless({}, $class);
	$self->{type} = lc($type);
	return $self;
} # new()

sub is_valid {
	my $self = shift;
	my $number = uc shift;

	if ($number =~ /^$re_sedol$/o) {
		return $2 == $self->_compute_checkdigit($1);
	}
	return ''
} # is_valid()

sub complete {
	my $self = shift;
	my $number = uc shift;

	if ($number =~ /^$re_sedol$/o) {
		return  $number . $self->_compute_checkdigit($number);
	}
	else {
		return '';
	}
} # complete()

sub basenumber {
	my $self = shift;
	my $number = uc shift;

	if ($number =~ /^$re_sedol$/o) {
		return $1 if ($2 == $self->_compute_checkdigit($1));
	}
	return '';
} # basenumber()

sub checkdigit {
	my $self = shift;
	my $number = uc shift;

	if ($number =~ /^$re_sedol$/o) {
		return $2 if ($2 == $self->_compute_checkdigit($1));
	}
	return '';
} # checkdigit()

sub _compute_checkdigit {
	my $self   = shift;
	my $number = shift;


	my @digits = map { $ctable{$_} } split(//,$number);
	my $sum    = 0;

	for (my $i = 0; $i <= $#digits; $i++) {

		$sum += $weight[$i] * $digits[$i];

	}
	return (10 - ($sum % 10)) % 10;